Nakanoquintuplets dzieła

This is not my original idea Inspired from PickleNugg [DISCONTINUED]

This story happens in 2nd grade after Fuutarou confessed to Yotsuba, leaving the Quintuplets in a heartbreak. The youngest, Itsuki Nakano chose to focus on her studies but then fell in love with her classmate, unfortunately, he is a player, unknowingly to Itsuki. Y/N is a senior to Itsuki, excellent and a popular student, a 3rd grader who observed from a distance and discovered her boyfriend's mischievous acts. A fateful meeting brings them close and gradually Y/N warns her about her boyfriend, she is in denial. How would Y/N handle this situation and how would it end for Itsuki?